CVE-2026-121238: Use after free in Source

Published Oct 5, 2026
·
Updated

Use after free in Source in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Credit

Xinyang Ge

Affected Software

6 affected componentsFixes available
Google Chrome<157.0.8103.38
157.0.8103.38
debian/chromium*
debian/chromium*
debian/chromium*
debian/chromium<=150.0.7871.100-1~deb12u1, <=156.0.8078.79-1~deb12u1, <=150.0.7871.181-1~deb13u1, <=156.0.8078.79-1~deb13u1, <=156.0.8078.47-1, <=156.0.8078.79-1
Google Chrome<157.0.8103.38

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 157.0.8103.38

Event History

Oct 5, 2026
CVE Published
12:00 AM
Data Sourced
12:00 AM
SeverityWeaknessAffected Software
Nov 3, 2026
CVE Published
via MITRE·08:42 PM
Data Sourced
via MITRE·08:42 PM
DescriptionWeakness
Data Sourced
via NVD·09:17 PM
DescriptionSeverityWeakness
Data Sourced
via OSV·09:17 PM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

Who is exposed to this issue?

Users running Google Chrome versions earlier than 157.0.8103.38 are exposed if they can be induced to interact with a crafted HTML page. Debian Chromium is also listed as affected software, but no fixed Debian package version is provided.

2

What does an attacker need to exploit it?

The attacker needs to deliver a crafted HTML page and have the target user interact with it. The vulnerability is network-reachable and does not require attacker privileges.

3

What should be prioritized for remediation?

Update Google Chrome to version 157.0.8103.38 or later. The available information does not provide an alternative mitigation for systems that cannot be updated immediately.

Company

Resources

Contact

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